﻿/* Copyright 2012 William Woodall and John Harrison */
#include <algorithm>

#if !defined(_WIN32) && !defined(__OpenBSD__) && !defined(__FreeBSD__)
#include <alloca.h>
#endif

#if defined(__MINGW32__)
#define alloca __builtin_alloca
#endif

#include "serial.h"

#ifdef _WIN32
#include "impl/win.h"
#else
#include "impl/unix.h"
#endif

using std::invalid_argument;
using std::min;
using std::numeric_limits;
using std::vector;
using std::size_t;
using std::string;

using serial::Serial;
using serial::SerialException;
using serial::IOException;
using serial::bytesize_t;
using serial::parity_t;
using serial::stopbits_t;
using serial::flowcontrol_t;

class Serial::ScopedReadLock {
public:
  ScopedReadLock(SerialImpl *pimpl) : pimpl_(pimpl) {
    this->pimpl_->readLock();
  }
  ~ScopedReadLock() { this->pimpl_->readUnlock(); }

private:
  // Disable copy constructors
  ScopedReadLock(const ScopedReadLock &);
  const ScopedReadLock &operator=(ScopedReadLock);

  SerialImpl *pimpl_;
};

class Serial::ScopedWriteLock {
public:
  ScopedWriteLock(SerialImpl *pimpl) : pimpl_(pimpl) {
    this->pimpl_->writeLock();
  }
  ~ScopedWriteLock() { this->pimpl_->writeUnlock(); }

private:
  // Disable copy constructors
  ScopedWriteLock(const ScopedWriteLock &);
  const ScopedWriteLock &operator=(ScopedWriteLock);
  SerialImpl *pimpl_;
};

Serial::Serial(const string &port, uint32_t baudrate, serial::Timeout timeout,
               bytesize_t bytesize, parity_t parity, stopbits_t stopbits,
               flowcontrol_t flowcontrol)
    : pimpl_(new SerialImpl(port, baudrate, bytesize, parity, stopbits,
                            flowcontrol)) {
  pimpl_->setTimeout(timeout);
}

Serial::~Serial() { delete pimpl_; }

void Serial::open() { pimpl_->open(); }

void Serial::close() { pimpl_->close(); }

bool Serial::isOpen() const { return pimpl_->isOpen(); }

size_t Serial::available() { return pimpl_->available(); }

bool Serial::waitReadable() {
  serial::Timeout timeout(pimpl_->getTimeout());
  return pimpl_->waitReadable(timeout.read_timeout_constant);
}

void Serial::waitByteTimes(size_t count) { pimpl_->waitByteTimes(count); }

size_t Serial::read_(uint8_t *buffer, size_t size) {
  return this->pimpl_->read(buffer, size);
}

size_t Serial::read(uint8_t *buffer, size_t size) {
  ScopedReadLock lock(this->pimpl_);
  return this->pimpl_->read(buffer, size);
}

size_t Serial::read(std::vector<uint8_t> &buffer, size_t size) {
  ScopedReadLock lock(this->pimpl_);
  uint8_t *buffer_ = new uint8_t[size];
  size_t bytes_read = 0;

  try {
    bytes_read = this->pimpl_->read(buffer_, size);
  } catch (const std::exception &e) {
    delete[] buffer_;
    throw;
  }

  buffer.insert(buffer.end(), buffer_, buffer_ + bytes_read);
  delete[] buffer_;
  return bytes_read;
}

size_t Serial::read(std::string &buffer, size_t size) {
  ScopedReadLock lock(this->pimpl_);
  uint8_t *buffer_ = new uint8_t[size];
  size_t bytes_read = 0;
  try {
    bytes_read = this->pimpl_->read(buffer_, size);
  } catch (const std::exception &e) {
    delete[] buffer_;
    throw;
  }
  buffer.append(reinterpret_cast<const char *>(buffer_), bytes_read);
  delete[] buffer_;
  return bytes_read;
}

string Serial::read(size_t size) {
  std::string buffer;
  this->read(buffer, size);
  return buffer;
}

size_t Serial::readline(string &buffer, size_t size, string eol) {
  ScopedReadLock lock(this->pimpl_);
  size_t eol_len = eol.length();
  uint8_t *buffer_ = static_cast<uint8_t *>(alloca(size * sizeof(uint8_t)));
  size_t read_so_far = 0;
  while (true) {
    size_t bytes_read = this->read_(buffer_ + read_so_far, 1);
    read_so_far += bytes_read;
    if (bytes_read == 0) {
      break; // Timeout occured on reading 1 byte
    }
    if (string(reinterpret_cast<const char *>(buffer_ + read_so_far - eol_len),
               eol_len) == eol) {
      break; // EOL found
    }
    if (read_so_far == size) {
      break; // Reached the maximum read length
    }
  }
  buffer.append(reinterpret_cast<const char *>(buffer_), read_so_far);
  return read_so_far;
}

string Serial::readline(size_t size, string eol) {
  std::string buffer;
  this->readline(buffer, size, eol);
  return buffer;
}

vector<string> Serial::readlines(size_t size, string eol) {
  ScopedReadLock lock(this->pimpl_);
  std::vector<std::string> lines;
  size_t eol_len = eol.length();
  uint8_t *buffer_ = static_cast<uint8_t *>(alloca(size * sizeof(uint8_t)));
  size_t read_so_far = 0;
  size_t start_of_line = 0;
  while (read_so_far < size) {
    size_t bytes_read = this->read_(buffer_ + read_so_far, 1);
    read_so_far += bytes_read;
    if (bytes_read == 0) {
      if (start_of_line != read_so_far) {
        lines.push_back(
            string(reinterpret_cast<const char *>(buffer_ + start_of_line),
                   read_so_far - start_of_line));
      }
      break; // Timeout occured on reading 1 byte
    }
    if (string(reinterpret_cast<const char *>(buffer_ + read_so_far - eol_len),
               eol_len) == eol) {
      // EOL found
      lines.push_back(
          string(reinterpret_cast<const char *>(buffer_ + start_of_line),
                 read_so_far - start_of_line));
      start_of_line = read_so_far;
    }
    if (read_so_far == size) {
      if (start_of_line != read_so_far) {
        lines.push_back(
            string(reinterpret_cast<const char *>(buffer_ + start_of_line),
                   read_so_far - start_of_line));
      }
      break; // Reached the maximum read length
    }
  }
  return lines;
}

size_t Serial::write(const string &data) {
  ScopedWriteLock lock(this->pimpl_);
  return this->write_(reinterpret_cast<const uint8_t *>(data.c_str()),
                      data.length());
}

size_t Serial::write(const std::vector<uint8_t> &data) {
  ScopedWriteLock lock(this->pimpl_);
  return this->write_(&data[0], data.size());
}

size_t Serial::write(const uint8_t *data, size_t size) {
  ScopedWriteLock lock(this->pimpl_);
  return this->write_(data, size);
}

size_t Serial::write_(const uint8_t *data, size_t length) {
  return pimpl_->write(data, length);
}

void Serial::setPort(const string &port) {
  ScopedReadLock rlock(this->pimpl_);
  ScopedWriteLock wlock(this->pimpl_);
  bool was_open = pimpl_->isOpen();
  if (was_open)
    close();
  pimpl_->setPort(port);
  if (was_open)
    open();
}

string Serial::getPort() const { return pimpl_->getPort(); }

void Serial::setTimeout(serial::Timeout &timeout) {
  pimpl_->setTimeout(timeout);
}

serial::Timeout Serial::getTimeout() const { return pimpl_->getTimeout(); }

void Serial::setBaudrate(uint32_t baudrate) { pimpl_->setBaudrate(baudrate); }

uint32_t Serial::getBaudrate() const { return uint32_t(pimpl_->getBaudrate()); }

void Serial::setBytesize(bytesize_t bytesize) { pimpl_->setBytesize(bytesize); }

bytesize_t Serial::getBytesize() const { return pimpl_->getBytesize(); }

void Serial::setParity(parity_t parity) { pimpl_->setParity(parity); }

parity_t Serial::getParity() const { return pimpl_->getParity(); }

void Serial::setStopbits(stopbits_t stopbits) { pimpl_->setStopbits(stopbits); }

stopbits_t Serial::getStopbits() const { return pimpl_->getStopbits(); }

void Serial::setFlowcontrol(flowcontrol_t flowcontrol) {
  pimpl_->setFlowcontrol(flowcontrol);
}

flowcontrol_t Serial::getFlowcontrol() const {
  return pimpl_->getFlowcontrol();
}

void Serial::flush() {
  ScopedReadLock rlock(this->pimpl_);
  ScopedWriteLock wlock(this->pimpl_);
  pimpl_->flush();
}

void Serial::flushInput() {
  ScopedReadLock lock(this->pimpl_);
  pimpl_->flushInput();
}

void Serial::flushOutput() {
  ScopedWriteLock lock(this->pimpl_);
  pimpl_->flushOutput();
}

void Serial::sendBreak(int duration) { pimpl_->sendBreak(duration); }

void Serial::setBreak(bool level) { pimpl_->setBreak(level); }

void Serial::setRTS(bool level) { pimpl_->setRTS(level); }

void Serial::setDTR(bool level) { pimpl_->setDTR(level); }

bool Serial::waitForChange() { return pimpl_->waitForChange(); }

bool Serial::getCTS() { return pimpl_->getCTS(); }

bool Serial::getDSR() { return pimpl_->getDSR(); }

bool Serial::getRI() { return pimpl_->getRI(); }

bool Serial::getCD() { return pimpl_->getCD(); }
